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They are inclined to the flywheel key letting go, this would account for the peculiar feel when you try to pull start it too. I had a cast iron Suffolk which did this, made a right mess of the keyway too.
It's pretty straightforward to have a look, from memory it's 4 bolts and 2 nuts to remove the cowling then a L/H threaded nut holding the flywheel
As the flywheel is keyed you don't have to worry about resetting the timing like Villiers engines
Close up of the key